cory_spence
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Two ASN's needed in this configuration?
Here's my proposed config:
--------------2851 2 T1's bonded to ISP A =======================> Internet
PIX 520 ------- Catalyst 3500XL| | (interconnected for BGP exchanges)
--------------2851 2 T1's bonded to ISP B =======================> Internet
Currently we have a single ASN for one multihomed router. For redundancy and load balancing, we're looking to utilize GLBP with the topology above. So, if I plan to do this, would I need a second ASN?
Thanks!!
C
--------------2851 2 T1's bonded to ISP A =======================> Internet
PIX 520 ------- Catalyst 3500XL| | (interconnected for BGP exchanges)
--------------2851 2 T1's bonded to ISP B =======================> Internet
Currently we have a single ASN for one multihomed router. For redundancy and load balancing, we're looking to utilize GLBP with the topology above. So, if I plan to do this, would I need a second ASN?
Thanks!!
C
No, you should continue to use one AS. You want to originate your prefix advertisement from one source via BGP.
I assume you have a /24 to advertise otherwise your route is being sumarized by your upstream provider. There are some complex scenarios in which multiple ASs are used but this is not one of them. GLBP is for your out going traffic only, your return path is not guareteed to come back the same way.
harbor235
I assume you have a /24 to advertise otherwise your route is being sumarized by your upstream provider. There are some complex scenarios in which multiple ASs are used but this is not one of them. GLBP is for your out going traffic only, your return path is not guareteed to come back the same way.
harbor235
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Just got off the phone with Cisco - they responded pretty quickly this time!
Anyway, they said pretty much the same thing as you, harbor235. Both routers advertise the same networks (two class c's that we own) by using the same ASN. Then we'll run iBGP inbetween the two using the 'next hop self' command. Harbor235, I'm going to award the points to you, but would you mind explaining to me what the next hop self command and how it will be helpful?
Also, are there any 'gotcha's' to this config/topology?
THANKS!!
C
Anyway, they said pretty much the same thing as you, harbor235. Both routers advertise the same networks (two class c's that we own) by using the same ASN. Then we'll run iBGP inbetween the two using the 'next hop self' command. Harbor235, I'm going to award the points to you, but would you mind explaining to me what the next hop self command and how it will be helpful?
Also, are there any 'gotcha's' to this config/topology?
THANKS!!
C
OIC! I'm sorry, I didn't read "Autonomous System Number", I read "Access Stack Nodes" which are OLD Bay routers. Sorry to be so DENSE! :)
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Where is the ASN in your diagram?
I like your diagram the way it is.
ASNs BAD.